US10540037B2 - Force detection method and apparatus, and electronic terminal - Google Patents

Force detection method and apparatus, and electronic terminal Download PDF

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US10540037B2
US10540037B2 US15/937,832 US201815937832A US10540037B2 US 10540037 B2 US10540037 B2 US 10540037B2 US 201815937832 A US201815937832 A US 201815937832A US 10540037 B2 US10540037 B2 US 10540037B2
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force
electrode
electrical signal
output electrical
capacitor
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US20180232096A1 (en
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Leigang CHENG
Dafei WEN
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position

Definitions

  • Embodiments of the present application relate to the technical field of force detection, and in particular, relate to a force detection method and apparatus, and an electronic terminal.
  • the touch technology when applied to a smart terminal, enables a user to operate the terminal only by means of gesture operations. As such, a traditional mechanical keyboard is not needed, such that man-machine interaction is simpler and more direct.
  • a user's finger touch on the display screen would generate a two-dimensional coordinate input.
  • touch technologies for example, capacitive touch
  • pure finger touch may not accommodate the demands of multi-dimensional input of the user.
  • Deploying the force detection technology (Force Touch) in the capacitive touch screen may increase an input dimension, which allows the touch screen to sense force information of the finger, and sense a light force or a heavy force.
  • Force detection technology of the touch screen generally touch display is implemented in combination with a display device by means of detecting variations of a capacitor formed between a force sensing electrode and a reference electrode in a force sensor.
  • two capacitors are present.
  • One capacitor is a force detecting capacitor
  • the force detecting capacitor is formed between a force sensing electrode and a reference electrode, a gap which deforms when a force is applied is present between the force sensing electrode and the reference electrode, the capacitance of the force detecting capacitor represents the variation of the force.
  • an additional load capacitor is also present.
  • the load capacitor is formed between the force sensing electrode and a load electrode, and a gap between the force sensing electrode and the load electrode almost does not vary when a force is applied. Based on a conventional force detection model, since the load capacitor is present, in one aspect, the force detection model is complicated, and in another aspect, the total capacitance is increased.
  • Embodiments of the present application are intended to provide a force detection method and apparatus, and an electronic terminal, to at least solve the above technical problem in the related art.
  • embodiments of the present application provide a force detection method.
  • the method includes:
  • Embodiments of the present application further provide a force detection apparatus.
  • the force detection apparatus includes: a driving electrode, a force sensing electrode and a reference electrode; where a voltage dividing capacitor is formed between the driving electrode and the force sensing electrode, a force detecting capacitor is formed between the force sensing electrode and the reference electrode, a gap variable with force is present between the sensing electrode and the reference electrode, and the voltage dividing capacitor and the force detecting capacitor are respectively configured to determine an output electrical signal of force feature data when a force is applied to the force sensing electrode.
  • Embodiments of the present application further provide an electronic terminal.
  • the electronic terminal includes the force detection apparatus based on any of the embodiments.
  • an output electrical signal of a voltage dividing capacitor formed between a driving electrode and a force sensing electrode, and an output electrical signal of a force detecting capacitor formed between the force sensing electrode and a reference electrode are acquired; and force feature data when a force is applied to the force sensing electrode is determined based on the output electrical signal of the voltage dividing capacitor and the output electrical signal of the force detecting capacitor.
  • FIG. 1 is a schematic diagram of a laminated structure of a force detection apparatus based on the first embodiment of the present application
  • FIG. 2 is a schematic diagram of an equivalent circuit of a force detection apparatus based on the second embodiment of the present application
  • FIG. 3 is a schematic flowchart of a force detection method based on the third embodiment of the present application.
  • FIG. 4 is a schematic diagram of a relationship between force feature data and force values based on the fourth embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a force detection method based on the fifth embodiment of the present application.
  • FIG. 6 is a schematic diagram of a curve of practicing force feature data when a force is applied based on the sixth embodiment of the present application;
  • FIG. 7 is a schematic structural diagram of a force detection apparatus based on the seventh embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a force detection apparatus based on the eighth embodiment of the present application.
  • FIG. 9 is a schematic diagram of electric field distribution of a force detection apparatus based on the ninth embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a force detection apparatus based on the tenth embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of an equivalent circuit of a force detection apparatus based on the eleventh embodiment of the present application.
  • FIG. 12 is a schematic flowchart of a force detection method based on the twelfth embodiment of the present application.
  • FIG. 13 is a schematic diagram of an electric field of a force detection apparatus based on the thirteenth embodiment of the present application.
  • FIG. 14 is a schematic diagram of an electric field of a force detection apparatus based on the fourteenth embodiment of the present application.
  • FIG. 15 is a schematic diagram of a laminated structure of a force detection apparatus based on the fifteenth embodiment of the present application.
  • FIG. 16 is a schematic diagram of an electric field of a force detection apparatus based on the sixteenth embodiment of the present application.
  • FIG. 17 is a schematic planar diagram of a force detection apparatus based on the seventeenth embodiment of the present application.
  • FIG. 18 is a schematic planar diagram of a force detection apparatus based on the eighteenth embodiment of the present application.
  • FIG. 19 is a schematic laminated diagram of a force detection apparatus based on the nineteenth embodiment of the present application.
  • FIG. 20 is a schematic diagram of an electric field of a force detection apparatus based on the twentieth embodiment of the present application.
  • FIG. 21 is a schematic diagram of an electric field of a force detection apparatus based on the twenty-first embodiment of the present application.
  • FIG. 22 is a schematic planar diagram of a force detection apparatus based on the twenty-second embodiment of the present application.
  • FIG. 23 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-third embodiment of the present application.
  • FIG. 24 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-forth embodiment of the present application.
  • FIG. 25 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-fifth embodiment of the present application.
  • FIG. 26 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-sixth embodiment of the present application.
  • FIG. 27 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-seventh embodiment of the present application.
  • FIG. 28 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-eighth embodiment of the present application.
  • FIG. 29 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-ninth embodiment of the present application.
  • FIG. 30 is a schematic structural diagram of an application example of a force detection apparatus based on the thirtieth embodiment of the present application.
  • FIG. 31 is a schematic structural diagram of an application example of a force detection apparatus based on the thirty-first embodiment of the present application.
  • an output electrical signal of a voltage dividing capacitor formed between a driving electrode and a force sensing electrode, and an output electrical signal of a force detecting capacitor formed between the force sensing electrode and a reference electrode are acquired; and force feature data when a force is applied to the force sensing electrode is determined based on the output electrical signal of the voltage dividing capacitor and the output electrical signal of the force detecting capacitor.
  • FIG. 1 is a schematic diagram of a laminated structure of a force detection apparatus based on the first embodiment of the present application.
  • the force detection apparatus in this embodiment includes: a driving electrode 101 , a force sensing electrode 102 , and a reference electrode 103 .
  • the driving electrode 101 is specifically an electrode additionally arranged between the force sensing electrode 102 and a load electrode 104 , for example, a Vcom layer, in the related art.
  • the reference electrode 103 is specifically a conductive middle frame of an electronic terminal where the force detection apparatus is located.
  • the reference electrode 103 is connected to the system ground.
  • the additionally arranged driving electrode 101 and the force sensing electrode 102 have the same shape and the same area.
  • an environment detecting capacitor C V is formed between the additionally arranged driving electrode 101 and the load electrode 104 , for example, the Vcom layer.
  • another conductive surface that is closest to the force sensing electrode in addition to the reference electrode 103 and the driving electrode 101 may also be used as the load electrode 104 , as long as the environment detecting capacitor C V is formed between the conductive surface and the driving electrode 101 .
  • a voltage dividing capacitor C S is formed between the driving electrode 101 and the force sensing electrode 102 . The voltage dividing capacitor C S generates a corresponding output electrical signal when a force is applied to the force sensing electrode.
  • a gap variable with force is present between the force sensing electrode 102 and the reference electrode 103 , such that the force detecting capacitor C M formed between the force sensing electrode 102 and the reference electrode 103 may vary with the variation of the gap, and the force detecting capacitor C M generates a corresponding output electrical signal when a force is applied to the force sensing electrode.
  • the output electrical signal may reflect the variation of the force detecting capacitor, such that force feature data when a force is applied to the force sensing electrode 102 is determined based on the output electrical signal of the voltage dividing capacitor C S and the output electrical signal of the force detecting capacitor C M .
  • FIG. 2 is a schematic diagram of an equivalent circuit of a force detection apparatus based on the second Embodiment of the present application.
  • point A corresponds to the driving electrode 101
  • point B corresponds to the force sensing electrode 102 , which correspond to the laminated structure in FIG. 1 .
  • circuit connections between the environment detecting capacitor C V , the voltage dividing capacitor C S and the force detecting capacitor C M are as illustrated in FIG. 2 .
  • the voltage dividing capacitor C S and the force detecting capacitor C M are connected in series. Due to a low output impedance of the driving electrode 101 , the environment detecting capacitor C V basically causes no impact on the driving signal. Therefore, the force feature data may be determined based on a voltage division relationship between the voltage dividing capacitor C S and the force detecting capacitor C M .
  • the specific technical process of determining the force feature data may be referenced to the method embodiment as illustrated in FIG. 3 .
  • a load capacitor C L formed between the force sensing electrode 102 and the load electrode 104 is transformed to: connection in series of the voltage dividing capacitor C S and the environment detecting capacitor C V , which is essentially equivalent to separating the load capacitor C L from the force detecting capacitor C M .
  • SNR signal-to-noise ratio
  • ⁇ U 1 denotes a voltage variation amount of the force detecting capacitor C M in the self-capacitance force detection solution in the related art
  • ⁇ U 2 denotes a voltage variation amount of the force detecting capacitor C M in the first embodiment
  • ⁇ C M denotes a variation amount of the force detecting capacitor C M when a force is applied relative to a reference force detecting capacitor C M0 when no force is applied.
  • ⁇ U 2 is greater than ⁇ U 1 .
  • FIG. 3 is a schematic flowchart of a force detection method based on the third Embodiment of the present application. As illustrated in FIG. 3 , the method includes the following steps:
  • the driving electrode is electrically connected to a driving circuit which provides a driving signal, and the driving circuit loads an alternating current signal having constant amplitude, for example, a sine wave, to the driving electrode 101 by means of coding; and the force sensing electrode is electrically connected to a detection circuit, and thus detects, via the detection circuit, a sensing signal output by the force sensing electrode 102 that is coupled to the driving signal.
  • the alternating current signal that is, the driving signal
  • the sensing signal output by the force sensing electrode 102 is detected at point B.
  • the output electrical signal of the voltage dividing capacitor C S and the output electrical signal of the force detecting capacitor C M may be respectively a voltage across the voltage dividing capacitor C S and a voltage across the voltage detecting capacitor C M .
  • the determining force feature data when a force is applied to the force sensing electrode 12 based on the output electrical signal of the voltage dividing capacitor C S and the output electrical signal of the force detecting capacitor C M in step S 303 may include the following steps:
  • the first voltage division ratio is calculated based on formula (2):
  • ForceData denotes the force feature data of the force sensing electrode 102 when a force is applied in the current environment.
  • FIG. 4 is a schematic diagram of a relationship between force feature data and force values based on the forth embodiment of the present application.
  • the force feature data ForceData and the force value F are in a linear relationship.
  • a current initial spacing d′ M0 is obtained.
  • reference force feature data ForceData′ 0 when no force is applied in the current environment may be obtained.
  • a feature data difference ⁇ ForceData is obtained by a subtraction between ForceData′ and ForceData′ 0 calculated based on formula (7).
  • the force value F when a force is applied is determined based on the feature data difference. Accordingly, based on the embodiments as illustrated in FIG. 3 , when the force value F is calculated by calculating the force feature data difference, the reference force feature data reflecting the impacts of the initial spacing is offset, such that the force value F is not affected by the change of the initial spacing. In this way, self-calibration of the initial gap is implemented.
  • FIG. 5 is a schematic flowchart of a force detection method based on the fifth embodiment of the present application. As illustrated in FIG. 5 , in this embodiment, description is given by using the case where the temperature or humidity in an environment affects the force feature data as an example. Specifically, the method includes the following steps:
  • C S0 denotes a reference coupling capacitor of the voltage dividing capacitor in the predetermined fixed environment, for example, a delivery-from-factory environment.
  • the variation factor ⁇ CS based on which the output electrical signal of the voltage dividing capacitor C S is subject to environment is determined based on the reference output electrical signal of the voltage dividing capacitor C S in the predetermined fixed environment and the real-time output electrical signal of the voltage dividing capacitor in the current environment. It should be noted that during determination of the variation factor based on which the output electrical signal is subject to environment, the variation factor may be determined when a force is applied to the force sensing electrode, or may be determined when no force is applied to the force sensing electrode, which is not described herein any further.
  • the driving signal may be loaded to the driving electrode 101 in the corresponding predetermined fixed environment or in the corresponding current environment, and the sensing signal of the force sensing electrode 102 is detected in a mutual-capacitance detection mode, such that the reference output electrical signal in the predetermined fixed environment and the real-time output electrical signal in the current environment are determined.
  • the variation factor ⁇ CS based on which the output electrical signal of the voltage dividing capacitor C S is subject to environment is determined by comparing the real-time output electrical signal of the voltage dividing capacitor C S in the current environment with the reference output electrical signal of the voltage dividing capacitor C S in the predetermined fixed environment.
  • the dielectric constant of a dielectric between the driving electrode 101 and the force sensing electrode 102 varies under the impacts of the temperature and humidity in the environment.
  • the dielectric constant of a dielectric between the force sensing electrode 102 and the reference electrode 103 also varies under the impacts of the environment.
  • the variation factor based on which the output electrical signal of the force detecting capacitor C M is subject to environment may be calibrated based on the variation factor based on which the output electrical signal of the voltage dividing capacitor C S is subject to environment determined in step S 501 . In this way, the voltage dividing capacitor C S is used as an environment sensor, and thus the impacts caused by the variation of the environment to the variation of the force detecting capacitor C M is determined by using the environment sensor.
  • step S 501 the variation factor km based on which the output electrical signal of the force detecting capacitor C M is subject to environment is determined.
  • a variation factor based on which the force feature data is subject to environment is determined based on the variation factor based on which the output electrical signal of the voltage dividing capacitor is subjected to environment and the variation factor based on which the output electrical signal of the force detecting capacitor is subject to environment.
  • the variation factor based on which the force feature data is subject to environment is determined based on a ratio of the variation factor based on which the output electrical signal of the voltage dividing capacitor is subjected to environment to the variation factor based on which the output electrical signal of the force detecting capacitor is subject to environment.
  • the variation factor based on which the force feature data is subject to environment is as follows:
  • the force feature data when the force is applied to the force sensing electrode is determined based on the variation factor based on which the force feature data is subject to environment, the output electrical signal of the voltage dividing capacitor and the output electrical signal of the force detecting capacitor.
  • the force feature data ForceData′ that is subject to environment when a force is applied is represented by the following formula:
  • Formula (11) is illustrated in FIG. 6 with a dotted line, where the slope of the dotted line is
  • Formula (5) is illustrated in FIG. 6 with a solid line, where the slope of the solid line is
  • a variation factor based on which the force detecting electrode is subject to environment may be further acquired based on a variation factor based on which the voltage dividing capacitor is subject to environment, and the output electrical signal of the force detecting capacitor may be calibrated based on the variation factor based on which the force sensing capacitor is subject to environment.
  • the force feature data of the force sensing electrode when a force is applied in the current environment based on the calibrated output electrical signal of the voltage dividing capacitor and the calibrated output electrical signal of the force detecting capacitor.
  • the output electrical signals of the voltage dividing capacitor and the force detecting capacitor may be calibrated, which is not described herein any further.
  • a force value when a force is applied in the current environment is determined based on force feature data when a force is applied in the current environment and reference force feature data when no force is applied in the current environment.
  • the force feature data difference ⁇ ForceData′ in the current environment may be calculated by using the following formula:
  • Formula (13) is obtained by transforming formula (12), and a force value F when a force is applied in the current environment is calculated by using the following formula:
  • FIG. 6 is a schematic diagram of a curve of practicing force feature data when a force is applied based on the sixth embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a force detection apparatus based on the seventh embodiment of the present application.
  • a small part of the load capacitor C L may remain between the edges of the load capacitor 104 (for example, a Vcom layer) and the force sensing electrode.
  • the load capacitor C L may cause impacts to the performance of real-time force detection.
  • FIG. 8 is a schematic structural diagram of a force detection apparatus based on the eighth embodiment of the present application. As illustrated in FIG. 8 , to eliminate the impacts caused by the load capacitor C L , in the embodiment as illustrated in FIG.
  • FIG. 9 is a schematic diagram of electric field distribution of a force detection apparatus based on the ninth embodiment of the present application. Since the area of the driving electrode 101 is greater than that of the force sensing electrode 102 , the load capacitor C L formed between the edge of the force sensing electrode 102 and the Vcom layer is extremely small, and thus the impacts caused to the force detection performance may be neglected.
  • the above method embodiment illustrating determination of the force feature data and the corresponding force value may be also applicable to the laminated structure of the force detection apparatus as illustrated in FIG. 8 , which is not described herein any further.
  • FIG. 10 is a schematic structural diagram of a force detection apparatus based on the tenth embodiment of the present application.
  • an area of the force sensing electrode 102 is greater than that of the driving electrode 101 . Therefore, the load capacitor C L is formed between the force sensing electrode 102 and the load electrode 104 , for example, the Vcom layer.
  • the dividing capacitor C S is formed between the force sensing electrode 102 and the driving electrode 101
  • the force detecting capacitor C M is formed between the force sensing electrode 102 and the reference electrode 103
  • the environment detecting capacitor C L is formed between the driving electrode 1001 and the load electrode 104 , for example, the Vcom layer.
  • FIG. 11 is a schematic structural diagram of an equivalent circuit of a force detection apparatus based on the eleventh embodiment of the present application.
  • the force detecting capacitor C M is connected in parallel to the load capacitor C L and the connected in series to the voltage dividing capacitor C S . Since the driving electrode has a low output impedance, the environment detecting capacitor C V almost causes no impact to the driving signal.
  • FIG. 10 is merely an exemplary structure of the formed load capacitor.
  • the structure in FIG. 7 may also form a load capacitor, and reference may be made to the equivalent circuit structure as illustrated in FIG. 11 , which is not described herein any further.
  • determination of the force feature data may be referenced to FIG. 12 .
  • FIG. 12 is a schematic flowchart of a force detection method based on the twelfth embodiment of the present application. As illustrated in FIG. 12 , the method includes the following steps.
  • the step of loading the driving signal to the driving electrode 101 and acquiring the output electrical signals of various capacitors based on the sensing signal output by the force sensing electrode 102 is similar to that in the detection method as illustrated in FIG. 1 , which is not described herein any further.
  • step S 1201 the step of loading the driving signal to the force sensing electrode 102 and acquiring the output electrical signals of various capacitors based on the sensing signal output by the driving electrode 101 are similar to step S 1201 .
  • First raw force feature data is calculated based on a ratio of the output electrical signal of the voltage dividing capacitor to a sum of the output electrical signals of the force detecting capacitor, the load capacitor and the voltage dividing capacitor in step S 1201 .
  • FIG. 13 is a schematic diagram of an electric field of a force detection apparatus based on the thirteenth embodiment of the present application. Based on the electric field, the ratio Rate 1 of the output electrical signal of the voltage dividing capacitor C S to the sum of the output electrical signals of the force detecting capacitor C M , the load capacitor and the voltage dividing capacitor C S , and the first raw force feature data RawData 1 be respectively calculated by using formula (14).
  • Second raw force feature data is calculated based on a ratio of the output electrical signal of the voltage dividing capacitor to a sum of the output electrical signals of the environment detecting capacitor and the voltage dividing capacitor in step S 1202 .
  • FIG. 14 is a schematic diagram of an electric field of a force detection apparatus based on the fourteenth embodiment of the present application.
  • a signal value of the output electrical signal of the environment detecting capacitor C V is divided by a sum of signal values of the output electrical signals of the environment detecting capacitor C V and the voltage dividing capacitor C S , and a second voltage division ratio Rate 2 and the second raw force feature data RawData 2 are determined.
  • the second raw force feature data is equivalent to environment feature data in the current environment.
  • the output electrical signal of the environment detecting capacitor C V is specifically a voltage signal U CV
  • the output electrical signal of the voltage dividing capacitor C S is specifically U CS .
  • step S 1204 the second ratio is acquired based on the signal value of the output electrical signal of the voltage dividing capacitor C S and the sum of the signal values of the output electrical signals of the environment detecting capacitor C V and the voltage dividing capacitor C S , and the second raw force feature data is calculated.
  • the output electrical signal of the load capacitor v may be determined based on a proportional relationship between the load capacitor C L and the environment detecting capacitor C V , and the output electrical signal of the environment detecting capacitor C V .
  • FIG. 15 is a schematic diagram of a laminated structure of a force detection apparatus based on the fifteenth embodiment of the present application.
  • FIG. 16 is a schematic diagram of an electric field of a force detection apparatus based on the sixteenth embodiment of the present application.
  • an area of the driving electrode 101 is greater than that of the force sensing electrode 102 .
  • the scenario where a load capacitor may be present between wiring of the force sensing electrode 102 and the load electrode 104 for example, the Vcom layer is considered.
  • a shielding electrode 105 is further arranged between the wiring of the force sensing electrode 102 and the load electrode 104 , for example, the Vcom layer, where the shielding electrode 105 is configured to shield the load capacitor C L formed between the wiring of the force sensing electrode 102 and the load electrode 104 .
  • the shielding electrode 105 is arranged between the wiring of the force sensing electrode and the load electrode.
  • the shielding electrode 105 and the driving electrode may be arranged on the same layer, or may be up-to-down staggered.
  • the driving signal When a driving signal is loaded to the driving electrode 101 , the driving signal is simultaneously loaded to the shielding electrode 105 , and an output electrical signal of the voltage dividing capacitor C S formed between the driving electrode 101 and the force sensing electrode 102 and between the shielding electrode 105 and the force sensing electrode 102 respectively, and an output electrical signal of the force detecting capacitor C M formed between the force sensing electrode 102 and the reference electrode 103 are respectively obtained.
  • an environment detecting capacitor C V1 is formed between the driving electrode 101 and the load electrode 104
  • the environment detecting capacitor C V2 is formed between the shielding electrode 105 and the load electrode 104
  • voltage detecting capacitors C M1 and C M2 are respectively formed between the force sensing electrode 102 and the reference electrode 103 and between the wiring of the force sensing electrode 102 and the reference electrode 103
  • a voltage dividing capacitor C S1 is formed between the driving electrode 101 and the force sensing electrode 102
  • a voltage dividing capacitor C S2 is formed between the shielding electrode 105 and the wiring of the force sensing electrode 102 .
  • a sum of the environment detecting capacitor C V1 and the environment detecting capacitor C V2 is equal to the environment detecting capacitor C V in the above embodiment, which do not participate in determination of the force feature data; a sum of the voltage dividing capacitor C S1 and the voltage dividing capacitor C S2 is equal to the voltage dividing capacitor C S in the above formula for determining the force feature data; and a sum of the force detecting capacitor C M1 and the force detecting capacitor C M2 is equal to the force detecting capacitor C M in the above formula for determining the force feature data.
  • the driving signal when the driving electrode 101 is electrically connected to the driving signal, the driving signal is simultaneously loaded to the shielding electrode 105 .
  • Driving capabilities of a driving circuit are considered. For example, in a driving circuit, if a single driving channel has a strong driving capability, one driving channel may be used to simultaneously loading the same driving signal to both the driving electrode 101 and the shielding electrode 105 ; or if a single driving channel has a weak driving capability, two driving channels may be used to respectively load driving signals with the same attributes (frequency, amplitude, phase and the like) to the driving electrode 101 and the shielding electrode 105 .
  • one driving channel may be used to simultaneously load driving signals to the plurality of driving electrodes 101 and the plurality of shielding electrodes 105 . In this way, the number of driving channels may be decreased as much as possible.
  • the driving electrode 101 and the shielding electrode 105 may be arranged on the same layer. Since the same driving signal is loaded to the driving electrode 101 and the shielding electrode 105 , the driving electrode 101 may also be directly connected to the shielding electrode 105 , and then a driving signal is loaded to the driving electrode 101 and the shielding electrode 105 by using one driving channel.
  • the force detection apparatus as illustrated in FIG. 15 may also employ the force detection method and the solution for determining the force value as described above, which are not described herein any further.
  • FIG. 17 is a schematic planar diagram of a force detection apparatus based on the seventh embodiment of the present application.
  • FIG. 18 is a schematic planar diagram of a force detection apparatus based on the 18th embodiment of the present application.
  • FIG. 17 and FIG. 18 for clear illustration of the schematic diagram of the shielding electrode 105 and the wiring thereof, other parts are not shown in the drawings, which are not described herein any further.
  • a shielding electrode 105 is correspondingly arranged for wiring of each force sensing electrode 102 , the plurality of shielding electrodes 105 share one driving channel, the plurality of driving electrodes 101 may share one driving channel, and a shielding electrode 105 and a driving electrode 101 may share one driving channel.
  • an area of a force sensing electrode 102 is greater than the driving electrode 101 is arranged, such that the driving electrode 101 forms the voltage dividing capacitor C S with the force sensing electrode 102 and the wiring thereof, and the force sensing electrode 102 and the wiring thereof form the voltage detecting capacitor C M with the reference electrode 103 .
  • FIG. 19 is a schematic laminated diagram of a force detection apparatus based on the nineteenth embodiment of the present application.
  • the area of the driving electrode 101 is smaller than that of the force sensing electrode 102 .
  • the load capacitor C L is formed between the force sensing electrode 102 and the load electrode 104 , for example, the Vcom layer.
  • the environment interference capacitor formed by the wiring of the driving electrode 101 and the reference electrode is considered, and the impacts caused thereby to the environment feature data are eliminated.
  • the shielding electrode 105 is arranged between the wiring of the driving electrode 101 and the reference electrode 103 .
  • the shielding electrode 105 is configured to shield the environment interference capacitor formed between the wiring of the driving electrode 101 and the reference electrode 103 .
  • the shielding electrode 105 is arranged between the wiring of the driving electrode 101 and the reference electrode 103 .
  • the shielding electrode 105 and the force sensing electrode 102 may be arranged on the same layer, or may be up-to-down staggered. In this embodiment, the shielding electrode 105 and the force sensing electrode 102 may be located in the same layer.
  • FIG. 20 is a schematic diagram of an electric field of a force detection apparatus based on the twentieth embodiment of the present application.
  • FIG. 21 is a schematic diagram of an electric field of a force detection apparatus based on the twenty-first embodiment of the present application.
  • FIG. 20 and FIG. 21 are schematic diagrams of electric fields corresponding to FIG. 19 .
  • the output electrical signal of the voltage dividing capacitor C S formed between the driving electrode 101 and the force sensing electrode 102 , the output electrical signal of the force detecting capacitor C M formed between the force sensing electrode 102 and the reference electrode 103 , and the output electrical signal of the load capacitor C L formed between the force sensing electrode 102 and the load electrode 104 are respectively acquired based on the driving signal loaded to the driving electrode 101 and the detected sensing signal output by the force sensing electrode 102 .
  • the output electrical signals of the voltage dividing capacitors C S formed between the driving electrode 101 and the wiring thereof and the force sensing electrode 102 , and between the driving electrode 101 and the wiring thereof and the shielding electrode 105 , and the output electrical signal of the environment detecting capacitor C V formed between the driving electrode 101 and the wiring thereof and the load electrode 104 are respectively acquired based on the driving signal to which the force sensing electrode 102 and the shielding electrode 105 are electrically connected and the detected sensing signal output by the driving electrode 101 .
  • the shielding electrode 105 due to presence of the shielding electrode 105 , when the driving signal is loaded to the driving electrode 101 , the shielding electrode 105 is in the floating state; whereas when the driving signal is loaded to the force sensing electrode 102 , the same driving signal is simultaneously loaded to the shielding electrode 105 .
  • the environment detecting capacitor C V in the formula for determining the force feature data is obtained by summing the environment detecting capacitor C V1 and the environment detecting capacitor C V2
  • the voltage dividing capacitor C S in the formula for determining the force feature data is obtained by summing the voltage dividing capacitor C S1 and the voltage dividing capacitor C S2
  • the force detecting capacitor C M in the formula for determining the force feature data is obtained by summing the force detecting capacitor C M1 and the force detecting capacitor C M1 , C V , C S , C M and C L obtained herein are introduced into formula (14) and formula (15) to calculate the force feature data.
  • the force value F may be further determined by using formula (8).
  • FIG. 22 is a schematic planar diagram of a force detection apparatus based on the twenty-second embodiment of the present application. As illustrated in FIG. 22 , with respect to the laminated structure of the force detection apparatus as illustrated in FIG. 19 , for a clear illustration of the relationship between the driving electrode 101 , the force sensing electrode 102 and the shielding electrode 105 , the other relevant parts are not shown.
  • a shielding electrode 105 is arranged for wiring of each force sensing electrode 102 , and a plurality of shielding electrodes 105 may share one driving channel, or different driving channels may be individually arranged.
  • the force sensing electrode 102 and the shielding electrode 106 may share one driving channel, or different driving channels may be individually arranged. The number of driving channels may be specifically based on the driving capability.
  • a force sensing electrode 102 having a greater area may be arranged, such that the force sensing electrode 102 meanwhile achieves the technical effect of the shielding electrode 105 in this embodiment, which is not described herein any further.
  • FIG. 23 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-third embodiment of the present application.
  • the driving electrode 101 , the force sensing electrode 102 and the like may be made to a sensor 100 ; and a conductive middle frame of an electronic terminal where the force detection apparatus is located is the reference electrode 103 , to form the above force detection apparatus.
  • a lower foam 109 and the like filler may be arranged between the force sensing electrode in the sensor 100 and the conductive middle frame.
  • a Vcom layer is present between a lower glass 107 and an upper glass 106 , where the upper glass 106 and a cover 110 are sequentially arranged on the Vcom layer.
  • An upper foam 108 and the like filler are arranged between the sensor 100 and the lower glass 107 , such that a deformation caused by a user's force is transferred to the sensor 100 without any loss.
  • FIG. 24 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-forth embodiment of the present application. As illustrated in FIG. 24 , different from the embodiment as illustrated in FIG. 23 , a lower foam 109 is arranged between the force sensing electrode in the sensor 100 and the conductive middle frame, such that an air gap is present between the lower foam 109 and the conductive middle frame. In this way, the deformation amount of the force sensing capacitor when a force is applied is increased.
  • FIG. 25 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-fifth embodiment of the present application.
  • the upper foam 108 and the like filler do not need to be arranged between the sensor 100 and the lower glass 107 , and the sensor 100 is directly arranged on a lower surface of the lower glass 107 . That is, the force sensing electrode and the driving electrode are sandwiched between a filler deformable with the force, for example, the upper foam, and a substrate substantially deformable with the force, for example, the lower glass.
  • the filler between the driving electrode and the force sensing electrode may also be designed to a hollow structure, to adjust, for example, decrease, the capacitance of the voltage dividing capacitor formed between the driving electrode and the force sensing electrode.
  • FIG. 26 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-sixth embodiment of the present application. As illustrated in FIG. 26 , different from the embodiment as illustrated in FIG. 25 , a lower foam 109 is arranged between the sensor 100 and the conductive middle frame, such that an air gap is maintained between the lower foam 109 and the conductive middle frame. In this way, the deformation amount of the force sensing capacitor when a force is applied is increased.
  • the senor may include an upper-layer electrode and a lower-layer electrode, that is, a driving electrode and a force sensing electrode.
  • the driving electrode the load capacitor between the Vcom layer and the force sensing electrode in the related art is not needed, and the load capacitor is eliminated during determination of the force feature data.
  • another conductive metal layer, for example, the load electrode, over the force sensing electrode may also be the driving electrode, such that the load capacitor is not formed, and the load capacitor is likewise eliminated during determination of the force feature data.
  • the other metal layer is the driving electrode, the sensor includes only a single-layer electrode: the force sensing electrode.
  • FIG. 27 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-seventh embodiment of the present application.
  • a metal back shell may be present.
  • the metal back shell is used as the load electrode 104
  • the Vcom layer is used as the reference electrode 103 .
  • An air gap is present between the Vcom layer and the force sensing electrode 102 in the sensor 100 , such that the force detecting capacitor C M is formed.
  • FIG. 28 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-eighth embodiment of the present application.
  • the middle frame is used as the reference electrode 103 , and a compressible flexible adhesive is present between the force sensing electrode 102 in the sensor 100 and the middle frame to form the force detecting capacitor C M .
  • the driving electrode 101 may be the electrode in the touch sensing array 113 .
  • the force sensing electrode 102 and the driving electrode 101 are both located arranged on the periphery of an effective display region of the electronic terminal where the force detection apparatus is located.
  • FIG. 29 is a schematic structural diagram of an application example of a force detection apparatus based on the twenty-ninth embodiment of the present application. As illustrated in FIG. 29 , in this embodiment, with respect to the scenario where a virtual key electrode 115 is arranged correspondingly because a virtual key is arranged, the driving electrode 101 may be the virtual key electrode 115 . p
  • FIG. 30 is a schematic structural diagram of an application example of a force detection apparatus based on the thirtieth embodiment of the present application.
  • the sensor 100 includes the force sensing electrode 102
  • the driving electrode 101 in the sensor 100 is the load electrode 104 , for example, the Vcom layer.
  • the Vcom layer may be used as the driving electrode 101 in one aspect, and may achieve the effect of the Vcom layer in the related art in another aspect.
  • FIG. 31 is a schematic structural diagram of an application example of a force detection apparatus based on the thirty-first embodiment of the present application. As illustrated in FIG. 31 , different from FIG. 30 , an air gap similar to that in FIG. 20 is arranged.
  • the driving electrode and the force sensing electrode are both in a rectangular shape; or the driving electrode is in a circular shape, and the force sensing electrode is in a rectangular shape.
  • An embodiment of the present application further provides an electronic terminal.
  • the electronic terminal includes the force detection apparatus based on any of the embodiments.
  • the electronic terminal may be specifically a watch, a tablet computer, a touch panel, a force gauge, a mobile phone or the like.
  • the apparatus based on the embodiments of the present application may be practiced by a computer program.
  • a person skilled in the art should understand the above division of units and modules is only an exemplary one, and if the apparatus is divided into other units or modules or not divided, the technical solution shall also fall within the protection scope of the present application as long as the information object has the above functions.
  • the embodiments of the present application may be described to illustrate methods, apparatuses (devices), or computer program products. Therefore, hardware embodiments, software embodiments, or hardware-plus-software embodiments may be used to illustrate the present application.
  • the present application may further employ a computer program product which may be implemented by at least one non-transitory computer-readable storage medium with an executable program code stored thereon.
  • the non-transitory computer-readable storage medium comprises but not limited to a disk memory, a CD-ROM, and an optical memory.
  • These computer program instructions may also be stored a non-transitory computer-readable memory capable of causing a computer or other programmable data processing devices to work in a specific mode, such that the instructions stored on the non-transitory computer-readable memory implement a product comprising an instruction apparatus, where the instruction apparatus implements specific functions in at least one process in the flowcharts and/or at least one block in the block diagrams.
  • These computer program instructions may also be stored on a computer or other programmable data processing devices, such that the computer or the other programmable data processing devices execute a series of operations or steps to implement processing of the computer.
  • the instructions when executed on the computer or the other programmable data processing devices, implement the specific functions in at least one process in the flowcharts and/or at least one block in the block diagrams.

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  • General Physics & Mathematics (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
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US20180232096A1 (en) 2018-08-16

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